/**
 * @copyright Copyright (c) 2025 CSG Digital Grid Technology (Guangdong) Co., Ltd.
 * @author Xie Jinhui
 */

#include "main.h"

/**
 * @brief Main application entry point and system initialization coordinator
 * This function serves as the primary execution starting point that orchestrates
 * the complete application workflow including permission verification, logging setup,
 * configuration file validation, and command line argument processing
 * @param argc: Count of command line arguments provided during program invocation
 * @param argv: Array of character strings containing actual command line parameters
 * @return int Returns 0 on successful execution, -1 on critical initialization failures
 */
int main(int argc, char **argv)
{
    /* Commented out user permission verification and log file permission setup */
    /* This section would verify administrative privileges and set log file permissions */
    // struct passwd *pwd = getpwuid(getuid());
    // if (!strcmp(pwd->pw_name, "admin") || !strcmp(pwd->pw_name, "root"))
    // {
    //     if (system("sudo chmod 777 " LOG_PATH) < 0)
    //     {
    //         printf(LOG_PATH " permission problem!\r\n");
    //         exit(-1);
    //     }
    // }

    /* Commented out logging subsystem initialization routine */
    /* This would initialize the logging infrastructure for system diagnostics */
    // if (!log_manageInit())
    // {
    //     printf("log_manageInit error!\r\n");
    //     exit(-1);
    // }

    /* Configuration file validation and modernization section */
    /* Check if sim_config.json file requires updates to support multiple carrier APNs */
    /* This ensures backward compatibility while migrating to new carrier-based APN structure */
    static uint8_t CONFIG_STRING[JSON_LEN];
    
    /* Initialize configuration string buffer with null characters for safe string operations */
    /* This prevents buffer overflow and ensures clean parsing of configuration data */
    memset(CONFIG_STRING, 0x00, sizeof(CONFIG_STRING));
    
    /* Attempt to read and load the current APN configuration from persistent storage */
    /* This retrieves the existing configuration for analysis and potential modernization */
    if (getConfig(CONFIG_STRING, CONFIG_APN))
    {
        /* Comprehensive check for modern carrier-based APN configuration structure */
        /* Verify if configuration already contains separate entries for major carriers */
        /* This detection prevents unnecessary updates to already modernized configurations */
        if ((strstr((char *)CONFIG_STRING, "Mobile") == NULL) && (strstr((char *)CONFIG_STRING, "Unicom") == NULL) &&
            (strstr((char *)CONFIG_STRING, "Telecom") == NULL))
        {
            /* Execute configuration file modernization routine */
            /* Transform legacy APN configuration to new carrier-specific structure */
            /* This migration ensures compatibility with enhanced feature set */
            config_file_apn_Init((char *)CONFIG_STRING);
        }
    }

    /* Command line interface processing and dispatch section */
    /* Parse and execute user commands provided through command line arguments */
    /* This serves as the primary user interaction mechanism for system configuration */
    if (!getOptionParam(argc, argv))
    {
        /* Handle command line processing failures with appropriate error notification */
        /* This ensures users receive clear feedback when command syntax is incorrect */
        printf("main: getOptionParam error!\r\n");
        
        /* Terminate application with error code indicating command processing failure */
        /* This prevents partial execution with invalid or malformed user commands */
        exit(-1);
    }

    /* Successful application termination with clean exit status */
    /* Return code 0 indicates normal completion without errors or warnings */
    return 0;
}